Believe it baby. Like LEE says, if you reload for the Glock you just might be the next big winner in the "Glock Kaboom lottery":
Ask our OP. He and his Dad get it ... even if you don't.
You honestly have no clue and have been proven wrong by many, including mods. It is unfortunate that you believe you are right when actually, you are very wrong.
Lee is advising reloaders to not reload compromised cases fired from unsupported chambers. This is a no-brainer if the casings are damaged and isn't localized to unsupported Glock barrels.
I have loaded tens of thousands of Gen3/4 once fired Glock brass with appropriate charges and have had zero issues. Have reloaded the same brass 3-4 times over in some cases. No issues.
You have some learning to do.